Blast furnace



Patented Nov. 114, 11922.

3 SHEETS-SHEET 1.

-LKENNEDY.

BLAST FURNACE. APPLICATION FILED NOV. 24. 1920 1,43%85? J. KENNEDY.

BLAST FURNACE- APPLICATION FILED Nov 24. 1920.

Patented; Nov. M, 1922.

3 SHEETS-SHEET 2 J. KENNEDY. BLAST FURNACE.

APPLICATION FILED NOV. 24, 1920.

Patented Nov. ML, 1922.

gwvu Wioz m gm Patented Nov. i l, T1922,

JULIAN KENNEDY, 0F PITTSBURGH, PENNSYLVANIA.

BLAST FURNACE.

Application filed November 24, 1920, Serial No. 126,1207.

To all whom it may concern.

Be it known that I, JULIAN KENNEDY, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Blast Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, in which- Figure 1 is a vertical section of a portion of a blast furnace structure embodying my invention.

Figure 2 is a detail sectional view of a modification of the structure.

Figure 3 is a section of the lower portion of a blast furnace shaft, showing a modification.

Figures 4 and 5 are partial vertical sections showing, on a larger scale, portions of the structures shown, respectively in Figs. 1 and 3.

My invention has relation to improvements in blast furnaces; and more particularly to a novel construction of the shaft of the furnace whereby the usual mantle-plate and mantle supporting columns are done away with and the masonry of the shaft is provided with a surrounding metallic shell which forms the only external supporting means for the body of the shaft.

It has been found in practice that the usual supporting system consisting of a mantle-plate supporting columns therefor is defective. It frequently occurs F that the movements of the furnace shaft due to expansion and contraction are such as to either pull the mantle-plate away from the supporting columns at one side, or even to fracture the columns by reason of the distortion of the shaft. I have discovered that the difficulties due to the old system may be obviated by doing away with such system and supporting the shaft solely by a surrounding metallic shell e2;- tending from the base to the top of the shaft.

Referring first to that form of my inven tion shown in Figures 1 and l, the numeral 2 designates the masonry wall of a blast furnace shaft, and 8 the surrounding metallic shell. In accordance with my invention, l preferably construct the shaft with less outward flare or bulge at the bosh than has heretofore been the practice, and surround the entire bosh, hearth, and base portions of the furnace with the surrounding metallic shell 3, which is of sufficient strength to support the shaft. At the bosh portion of the furnace, where the diameter increases somewhat in an upward direction, the plates are preferably overlapped, as indicated. The base portion 2 of the furnace may be anchored to the sub-structure 4 in any suitable manner, as by means of the anchoring lugs 5, through which anchor rods 6 extend downwardly into the sub-structure, as shown in Figure 1. The base portion of the furnace may also be enlarged, as indicated at 7 in Figure 2, and be provided with foot brackets 8 through which anchor bolts 9 extend into the substructure. These brackets may be placed at suitable intervals or may extend entirely around the base of the furnace.

It will be noted that in the furnace shown in Figures 1 and 3 there is a comparatively slight external shoulder at the point Where the mantle-plate is usually placed. For the purpose of reinforcing the structure, and also to support the bustle pipe 10, I provide .the angles 11 at this shoulder, such angles having supporting brackets 11 and from which the bustle pipe is suspended by suitable hangers 12. These angles extend circumferentially around the structure, and greatly stiffen it. As many of such angles may be used as may be considered desirable in any particular case In the form of my invention shown in Figures 3 and 5, the shoulder adjacent the top of the bosh is entirely omitted, and the bustle pipe 10 is suspended by means of hangers 12 from angles 11, which are se cured to the mantle 11 riveted to the outer shell plates.

The advantages of my invention result from doing away with the usual mantle supporting system and supporting the furnace shaft wholly by means of the surrounding metallic shell. I have found that this shell may be of sufficient strength to afiord a sufficient support for the masonry shaft; that it possesses sufficient elasticity to permit of the necessary expansion and contraction movements of the masonry within safe limits but not permitting such movements to an undue extent. A further advantage resulting from doing away with the usual mantle-supporting system consists in the fact that it greatly simplifies the construction at the base of the structure; does away with the encumbrances formed by the mantle supporting columns; and enables the floor 14 to be carried up to the base of the furnace, and provides free space 15 below such floor to give access to the base of the furnace.

I do not desire to'limit myself to the particular constructions which I have illustrated, as it will be obvious that these may be modified in detail in various ways within the spirit and scope of the appended claims.

I claim:

1. A blast furnace shaft comprising an inner masonry Wall and an outer metallic shell, said shell extending the full height of the shaft and forming the only external support for the body of the shaft, substantially as described. A blast furnace shaft comprising an inner masonry wall and an outer metallic shell, said wall and shell being comparatively straight at the bosh portion of the furnace, said shell extending continuously the full height of the. shaft and forming the only external support for the body of the shaft, substantially as described.

3. A blast furnace shaft comprising an inner masonry wall and an outer metallic shell, said shell extending the full height of the shaft and forming the only external support for the body of the shaft, together with a bustle pipe and means secured to the metallic shell and forming a support for said pipe, substantially as described.

4:. A blast furnace structure comprising a masonry shaft and a surrounding metallic shell, said shell being self supporting from the base up, and also forming the sole support for the masonry shaft, substantially as described.

5. A blast furnace structure comprising a masonry shaft and a surrounding metallic shell, said shell being self supporting from the base up, and also forming the sole sup port for the masonry shaft, and having reinforcing members, substantially as described.

6. A blast furnace structure comprising a masonry shaft and a surrounding metallic shell, said shell being self supporting from the base up, and also forming the sole sup port for the masonry shaft, and having circumferentially extending reinforcing members, substantially as described.

7. A blast furnace shaft, comprising an outer metallic shell and an inner masonry wall, such shell extending the full length of the furnace, and sealing means supported at the top of said shell, said shell being selfsupporting and forming the only external support for the shaft, substantially as described.

8. A blast furnace shaft, comprising an outer metallic shell and an inner masonry wall, such shell extending the full length of the furnace, and sealing means supported at the top of said shell, said shell having a downwardly and inwardly contracting bosh portion and an upwardly and inwardly contracting stack portion, the shell being selfsupporting and forming the only external support for the shaft, substantially as described.

9. A blast furnace shaft, comprising an inner masonry wall and an outer metallic shell, said wall and shell having a downwardly contracting bosh portion and an upwardly contracting stack portion, the shaft and shell being self-supporting and the shell forming the only external support for the shaft, substantially as described.

10. A blast furnace shaft, comprising an inner masonry wall and an outer metallic shell, said wall and shell having a down wardly contracting bosh portion and an upwardly contracting stack portion, the Shaft and shell being self-supporting and the shell forming the only external support for the shaft, and said shell and shaft having boshcoolers supported therein, substantially as described. h

11. A blast furnace shaft comprising an inner masonry wall and an outer metallic shell, said shell extending the full height of the shaft and forming the only external support for the body of the shaft, said shell having a circumferentially extending reinforcement, and a bustle-pipe suspended from such reinforcement, substantially as described.

12. A blast furnace shaft, comprisingan inner masonry wall and an outer metallic shell, said shell extending the full height of the shaft and forming the only external support for the body of the shaft, said shell having anchoring means-at the bottom of its base portion, substantially as described.

In testimony whereof, I have hereunto set my hand.

JULIAN KENNEDY. 

